<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>input</title>
</head>
<body>
    username:<input type="text" placeholder="请输入用户名">
    <br><br>
    password:<input type="password" placeholder="请输入密码">
    <br><br>
    gender:<input type="radio" name="gender" checked>男 <input type="radio" name="gender">女
    <br><br>
    agree agreement:<input type="checkbox" checked>
    <br><br>
    file:<input type="file" multiple>
    <br><br>

</body>
</html>